Muffler attachment for telephones



May l0 1927' F. J. sTRoBEL.

MUFFLER ATTACHMENT FOR TELEPHONES Filed April 6, 1925 Patented. Eday 10? 1927.

Application. 'filed pi G,

heo ieuhiaieii io .-1 wie-phone iiieiiiii/leni mid so il'oiimed :is te ennhie an opeiniioi? 'to use lli parigini, Se tiene.. View show tio ine' :i device mede im :leem-dence with my inveniieii :ie applied to a standmd 'eienhene iiie'i'ument, and

Figi'. 2 i," a iioiit View of the device. Tith ifeiwmee io the di'zmiings. the de- "5 iiiee comprises a hoiiow Casing l having in its feifwmfd `ffice en Opening; 2 euii'oiinded hy an ouweidijy projecting 'Henne 3. The innge 3 is piovided Wih means for detach- :ihy securing thereto a mouthpiece 4. of Weii known type Cone ri'iei'ed Se es. to entirely eminaee the mouth oi ene 'using' Jdie iieiephone insi'iiinent to which this device is iidepi'ed to he aiii'eehed. the Seid mouthpiece heine' 'in the present inetzuiee threaded inte (he outer end of the flange The Casing has extending inwzndiy 4from H i'ezii or oppoeiie Side :i recess i formed (e receive the ififeneinitting heed G of Szinfhiid ieiephone inetilimeni. The ieeeef: 5f i lnnged iiimiiij: ai; die hoiiom es: indieiiized at i'. and ziiiiiis i3 exieni. iwidieiiy inmii'dly from 'ihe iiiengie :ind attach i heiii iniiei' ends te a. ring; 14. This ring M.. when the device .is applied to Jdie eieiphoiie in- 55 etifiimen, registeis with the mouth of 'he hitter. The fienge 7? :wins 13, and ring lhe helein ei" he recess 5 e .iei'iai, eiieh ne i-eh; ei' Spenge may he eomipi'eeeed te Some i :e iyiizii'iied sound eihsei'p i hue heen need zie ehem-ig oii i'he jgenei'zii ehm?- i. :im ziiiiii'e. ehe use oz nevei Witi me7 and i; heee, hoh es ige cheapn he iiihhei aise ieperiei iiee .in my device. iii heiding; -he ziteeh iifii in. Vijf Tveii #mee ihie; ned e,

iiieii' :in piece upon ihe i'eiephone ii'ieiriimenig.. f

ehoiii in Figi. 2. E piece en the 1feweed eide e'if ihe emilie' twe Sete of peiiinen'. weil illne-l e und 'heine' adapted 'for reception of :i i'e'iiiningg' eieixien: l2 'which in die pi'esen i the forni el zi Wiiie of inverted TWith the fitiaehmen; 'phiced ovei' lng: head G of the ineti'uinen ne T l. 'this ietaining element l2 hi'eiipgh 1he lugs eieiii'ly iihisin nig: and hy engagement Wiih .fi-: of heiiifenemipei..., j head pi'evei'is deinen ei? 'die aficinnent from the i instrument. The paris aie so pre-- ll. the pad 9 muet he Compressed to a cer tam it. theiehy main the eoimeei'ien inteiiei' ef Jhe Gesine; which entende not only i'enjt of the transmitting; head hut eieo cempeeiy mound its periphery, and

that Wihou iiieiei'iziiiy ineeesing the ove?- el eine of 'ihe nteehmen obtain un i 1 peneien chamber which 1S ampie to modihxji die iones ef' one speaking' mt@ the treuehe omging 'is .Founded mit (w .i z ie gie'i'iiiiiejy. and this no oiiifq adds "ce die si'eneiei eppeei'ance ef the device. hid: ehniae iefei'` ieeui'ts hy eliminating sheen eoi'nei'e emi oihei? obstructions.

The deziehehe nature of the n'ieiithiilieee is also of importance, Since it provides 'ei 

